P-30 Synthesis and Characterization of “Clean Surface” Gold Nanoparticles

We depict the synthesis of gold nanoparticle, free of stabilizing organic molecule, upon reduction of Au2O3 powder by hydrogen molecule in proportion of 0.8 g per 1.0 L of deionizer water. The content was free of oxygen gas by bubbled with argon gas through the spout and then saturated with hydrogen gas. The Au (III) reduction readily proceeds at elevated temperature, about 10 degree less than the boiling point of water, and at slightly higher pressure than the atmospheric pressure. The suspensions of the nanoparticles growth was monitored by UV-Vis, its size by TEM and dynamic light scattering and its surface chemistry by surface enhanced Raman scattering (SERS) employing a probing molecule. The stability of the suspended gold nanoparticles is suggested to have hydroxyl group on their surfaces